Stockholders' Equity - Cash Dividends Declared - Common Stock (Details) - $ / shares	3 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013
Stockholders' Equity Note [Abstract]
Declaration Date	Dec. 16, 2015	Sep. 18, 2015	Jun. 18, 2015	Mar. 18, 2015	Dec. 12, 2014	Sep. 18, 2014	Jun. 18, 2014	Mar. 13, 2014	Dec. 10, 2013	Sep. 12, 2013	Jun. 18, 2013	Mar. 18, 2013
Record Date	Dec. 28, 2015	Sep. 28, 2015	Jun. 29, 2015	Mar. 30, 2015	Dec. 22, 2014	Sep. 29, 2014	Jun. 30, 2014	Mar. 24, 2014	Dec. 20, 2013	Sep. 23, 2013	Jun. 28, 2013	Mar. 28, 2013
Payment Date	Jan. 25, 2016	Oct. 26, 2015	Jul. 27, 2015	Apr. 27, 2015	Jan. 26, 2015	Oct. 27, 2014	Jul. 25, 2014	Apr. 25, 2014	Jan. 27, 2014	Oct. 25, 2013	Jul. 25, 2013	Apr. 25, 2013
Cash Dividend Per Share	$ 0.24	$ 0.24	$ 0.27	$ 0.27	$ 0.27	$ 0.27	$ 0.27	$ 0.27	$ 0.27	$ 0.27	$ 0.27	$ 0.27